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Simplifying 1800 + (x + -1) * 120 = 1800 + (x + -1) * 120 Reorder the terms: 1800 + (-1 + x) * 120 = 1800 + (x + -1) * 120 Reorder the terms for easier multiplication: 1800 + 120(-1 + x) = 1800 + (x + -1) * 120 1800 + (-1 * 120 + x * 120) = 1800 + (x + -1) * 120 1800 + (-120 + 120x) = 1800 + (x + -1) * 120 Combine like terms: 1800 + -120 = 1680 1680 + 120x = 1800 + (x + -1) * 120 Reorder the terms: 1680 + 120x = 1800 + (-1 + x) * 120 Reorder the terms for easier multiplication: 1680 + 120x = 1800 + 120(-1 + x) 1680 + 120x = 1800 + (-1 * 120 + x * 120) 1680 + 120x = 1800 + (-120 + 120x) Combine like terms: 1800 + -120 = 1680 1680 + 120x = 1680 + 120x Add '-1680' to each side of the equation. 1680 + -1680 + 120x = 1680 + -1680 + 120x Combine like terms: 1680 + -1680 = 0 0 + 120x = 1680 + -1680 + 120x 120x = 1680 + -1680 + 120x Combine like terms: 1680 + -1680 = 0 120x = 0 + 120x 120x = 120x Add '-120x' to each side of the equation. 120x + -120x = 120x + -120x Combine like terms: 120x + -120x = 0 0 = 120x + -120x Combine like terms: 120x + -120x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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